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Merck
CN

215112

Phosphorous acid

99%

Synonym(s):

Phosphonic acid

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About This Item

Empirical Formula (Hill Notation):
H3O3P
CAS Number:
13598-36-2
Molecular Weight:
82.00
NACRES:
NA.21
PubChem Substance ID:
329752161
UNSPSC Code:
12352106
EC Number:
237-066-7
MDL number:
MFCD00137258

Key Documents

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Product Name

Phosphorous acid, 99%

InChI key

ABLZXFCXXLZCGV-UHFFFAOYSA-N

InChI

1S/H3O3P/c1-4(2)3/h4H,(H2,1,2,3)

SMILES string

[H]P(O)(O)=O

assay

99%

form

crystals or chunks
flakes

Quality Level

100

pH

(acidic)

solubility

water: soluble

density

1.651 g/mL at 25 °C (lit.)

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Application

Phosphorous acid (H3PO3, orthophosphorous acid) may be used as one of the reaction components for the synthesis of the following:
  • α-aminomethylphosphonic acids via Mannich-Type Multicomponent Reaction
  • 1-aminoalkanephosphonic acids via amidoalkylation followed by hydrolysis
  • N-protected α-aminophosphonic acids (phospho-isosteres of natural amino acids) via amidoalkylation reaction

General description

Phosphorous acid (or phosphonic acid) is a phosphorus oxoacid commonly used as an intermediate in chemical synthesis for the production of various phosphorus compounds. It is also used as a strong reducing agent in organic synthesis.

pictograms

CorrosionExclamation mark
GHS05,GHS07

signalword

Danger

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1A

Storage Class

8A - Combustible corrosive hazardous materials

wgk

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

Regulatory Information

危险化学品
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Certificates of Analysis (COA)

Lot/Batch Number
MKDB0919
MKCZ6678
MKCS2013
MKCS4814
MKCP8300

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  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

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    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  5. What is Product 215112, Phosphorous acid, soluble in?

    Phosphorous acid is appreciably soluble in water.

  6. What is the melting point of Product 215112, Phosphorous acid?

    The melting point of phosphorous acid is approximately 74°C.

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    Ask a Scientist here.

Amidoalkylation of phosphorous acid.
Vinyukov AV, et al.
Russ. J. Gen. Chem., 85(2), 366-369 (2015)
Ping Yin et al.
Bioresource technology, 110, 258-263 (2012-02-22)
Esterification of oleic acid with ethanol catalyzed by organophosphonic acid-functionalized silica SG-T-P was optimized using response surface methodology (RSM). The interactive effect of catalyst to FFA weight ratio and molar ratio of alcohol to acid were more significant than that
Emily B Pentzer et al.
Advanced materials (Deerfield Beach, Fla.), 24(17), 2254-2258 (2012-03-28)
Poly(3-hexyl thiophene) containing chain-end thiols or phosphonic acids is crystallized to yield nanowires with the functional groups at the wire edges. CdSe quantum dots and nanorods associate with these fibrils, leading to 'superhighways' that consist of alternating parallel lanes of
Alexander Rief et al.
PloS one, 7(9), e45345-e45345 (2012-10-03)
On alpine pastureland the decline in large-bodied earthworm numbers and biomass after abandonment of management might be the result of a shift from highly palatable grass litter to poorly digestible leaf litter of dwarf shrubs. To test this hypothesis, we
Alain Graillot et al.
Journal of hazardous materials, 244-245, 507-515 (2012-11-28)
In order to remove metal ions from wastewaters, thermosensitive copolymers bearing sorption properties toward metal cations were prepared by free radical copolymerization between the N-n-propylacrylamide (NnPAAm) and the (dimethoxyphosphoryl)methyl 2-methylacrylate (MAPC1), followed by a hydrolysis of the phosphonated esters into
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